Step inside the making of Harry Potter and the Deathly Hallows Pt. 1 with a set of behind-the-scenes videos that reveal the challenges the Academy Award-nominated FX team faced. Watch how the effects wizards reimagined the polyjuice potion scene, so a room full of teenagers becomes a room full of Potter doppelgängers!

There's also a collection of past FX Potter reels circulating the internet. Here are some of the best clips: